Tests Cast Doubt on F.C.C. Restrictions on Kindle and iPad — The Federal Aviation Administration has its reasons for preventing passengers from reading from their Kindles and iPads during takeoff and landing. But they just don't add up. — Since I wrote a column last month asking why these rules exist …

The year in mobile apps: Where we've been, where we're going — Smartphone and tablet purchases have been on the rise for several years, but 2011 was a turning point: This was the first year that these mobile devices outsold desktop and laptop PCs. The effect — and perhaps some of the cause of this …

Congress calls on Twitter to block Taliban — American congressmen are calling on Twitter to block Taliban propagandists from the micro-blogging site. — Aides for Joe Lieberman, chair of the Senate Homeland Security Committee, said the move was part of a wider attempt …

Foursquare's Dennis Crowley talks of check-ins — This summer, location-based social network Foursquare moved its San Francisco office from a small space it shared with The Chronicle to a big new office in SoMa. — In May, the service reported 7.5 million users. Today, it has more than 15 million.

Publishers vs. Libraries: An E-Book Tug of War — LAST year, Christmas was the biggest single day for e-book sales by HarperCollins. And indications are that this year's Christmas Day total will be even higher, given the extremely strong sales of e-readers like the Kindle and the Nook.

Growth of Twitter Fueled by Media Coverage — A new study by MIT, which seeks to understand Twitter's “contagion process,” has found that news media played a crucial role in the site's growth. The study tracked development from 2006 to 2009, and also found that more traditional forms of social networking …

PSD2 Compliance in Zoho Books — The Revised Payment Services Directive, also known as the PSD2, is a set of regulatory guidelines laid down by the European Union (EU) for finance, banking, and payment service companies.

Google Fi - a phone plan, by Google — We felt that most phone plans just weren't made with you in mind. So that's why we built Google Fi with features that real people actually want. Click to learn more.